Astronomy 350
Lecture 40, Dec 10
Fall 2012
Lecture Notes:
pdf file
Formation of Cosmic Structures
starting point: tiny density
fluctuations
gravitational (Jeans) instability
cold dark matter (CDM)
hierarchical structure formation
evidence for interactions: merging galaxies
NGC 2623
Arp 273
galaxies "on a string"
same
a zooful
and black holes
Sagittarius
dwarf
galaxy
cannibalism
by the Milky Way!
Magellanic stream
cartoon
,
reality
final result:
observed
structures today
Cosmos in a Computer
cosmos on a
grid
the growth of structure:
theory
,
observation
same
simulation
using physical=non-expanding versus expanding coordinates
the cosmic web: in
dark matter
,
gas ("baryons")
a galaxy cluster merger
millenium simulation:
evolution
over time,
zoom into snapshot
simulation of
Milky Way formation
Cosmic Star Formation
the first star:
still
,
movie
cosmic star formation
history
Lecture Archive
Brian D. Fields
Last modified: Mon Dec 10 10:35:59 CST 2012